/**
* Copyright (c) 2012-2013 Nokia Corporation. All rights reserved.
* Nokia and Nokia Connecting People are registered trademarks of Nokia Corporation. 
* Oracle and Java are trademarks or registered trademarks of Oracle and/or its
* affiliates. Other product and company names mentioned herein may be trademarks
* or trade names of their respective owners. 
* See LICENSE.TXT for license information.
*/
package com.nokia.example.racer.sensor;

/*
 * A wrapper class that ensures that the midlet does not crash if sensors are
 * not supported by the device.
 */
public abstract class AccelerationProvider {

    private Listener listener;

    /**
     * Callback method for subclasses
     *
     * @param ax X acceleration
     * @param ay Y acceleration
     * @param az Z acceleration
     */
    protected final void dataReceived(double ax, double ay, double az) {
        if (listener != null) {
            listener.dataReceived(ax, ay, az);
        }
    }

    /**
     * Closes the sensor connection
     */
    public abstract void close();

    /**
     *
     * @param listener Acceleration event listener
     * @return Acceleration provider implementation that provides acceleration
     * events.
     */
    public static AccelerationProvider getProvider(Listener listener) 
        throws Exception {
        AccelerationProvider provider = null;
        
        Class.forName("javax.microedition.sensor.SensorConnection");
        Class c = Class.forName("com.nokia.example.racer.sensor."
                + "AccelerationProviderImpl");
        provider = (AccelerationProvider) c.newInstance();
        provider.listener = listener;
     
        return provider;
    }

    public interface Listener {

        void dataReceived(double ax, double ay, double az);
    }
}
